Platen for typewriters and analogous machines



Aug. 25, 1931. G. M. SCHERERV PLATEN FOR TYPEWRITERS AND ANALOGOUS MACHINES Filed Janl 23, 1930 2 Sheets-Sheet 1 INVENTOR' GzlbcrZMSiuzr ATTORNEYS.

1931- G. M. SCHERER 1,820,164

PLATEN FOR TYPEWRITERS AND ANALOGOUS MACHINES Filed Jan. 25, l930 2 Sheets-Sheet 2 INVENTOR ATTORN'CYS.

Patented Aug. 25, 1931 UNITED STATES PATENT orrice GILBERT M. SOHERER, OF NEW YORK, N. Y., ASSIGNOR TO ROYAL TYPEWRIT'ER COMPANY, INC., OF YORK, N. Y., A CORPORATION OF'NE W YORK PLATEN FOR TYPEWRITERS AND .ANALOGOUS- MACHINES A neeuen filed January 23, 1930. Serial No. 422,851.

This invention relates to new and useful improvements in platens adapted for-use in typewriters and analogous machines. It is necessary in constructing typewriter platens to provide for sufficient resistance to the t pe impact whereby the writing will be legible not only on the original sheet but on a number of second sheets. This type impact has heretofore resulted in considerable noise and many attempts have been made to eliminate such noise or to greatly reduce the same.

The principal object df my invention is to provide a platen of a construction which will insure a considerably reduced noise under type impact than heretofore ossible of accomplishment, and "to the met 0d of making such a platen. In the drawings: Figure 1 is a perspective view showing the first step in the method employed when orming a platen embodying my invention, the view showing several sections which have been cut across the grain of a block of wood, Figure 2 is a perspectivevview showing 5 one of' these wood sections after it has been shaped into substantially triangular cross section, the view showing the second step in the method employed by my invention,

Figure 3 is a perspective View showing the wood sections positioned side by side in a circular series to form a hexagonal core, the sections being rigidly secured together, the View illustrating the next step in the method embodying my invention, Figure 4 is a view similar to Figure 3 but showing the core after it has been shaped into a cylindrical form, the view showing the next step in the method embodying my invention,

Figure 5 is a perspective view of a metal tube which 'forms a support for the wooden core,

in accordance with my invention, the view being partly in longitudinal section and partly in elevation,

Figure 7 is a cross sectional view taken on the 'line 7-7 of Figure 6, Figure 8 is a perspective view similar t Figure 3 but showing a slightly modified Figure 6 is a view of a platen completed line 11-11: of Figure 10,

Figure 12 is an end elevation of the core shown in Figures 3 and 4, the dotted line 05 showing the original hexagonal outline and the full line showing the cylindrical surface, and

Figure 13 is a perspective View of a platen constructed in accordance with myinvention showing the use of a plurality of short wood sections.

It is generally known that wood when re ceiving a blow in the direction of its grain is less resonant than if the blow .is received 7 laterally of the grain, and therefore I have constructed a platen having a cylindrical core in which the grain extends radially to all points of the cylindrical surface thereof.

In carrying out my invention, I first take a blank A of wood and out said blank transversely into a plurality of sections 5. Each section is substantially rectangular in cross section and the grain of the wood extends transversely of the sections. Each section 5 has two of its sides beveled so as to form a resultant section of substantially triangular cross section. The sides of each section may be beveled by sawing or planing. As shown in Figure 3, the sections 5 are then positioned side by-side in a circular series to forma resultant hexagonal prism, and the sections are rigidly secured together by glue or other suitable means. The assembly is then provided with an axial bore 6 extending throughout its length and a metal support 7, which is preferably in the form of a tube, is inserted within said bore and in tight contact with the sections. It is apparent, however, that instead of forming thev bore 6 after the sections have been assembled, such a bore may be formed by previously curving the adj a7cent pieces of the sections. The assembly as shown in Figure 3 is then shaped on its outer surface to form a cylinder as shown in Figure 4. This shaping may be done either before or after the support 7 has been positioned within the assembly. The ends of the core are then respectively formed with recesses 8-8 and it will be understood that these recesses may be formed either prior to or subsequent to the insertion of the metal support 7 and either before or after shaping the hexagonal prism. An impact-receiving covering 9, preferably of rubber, is then positioned over the completed core as shown in Figure 6.

Trunnions 10-10 are then secured to theends of the core by screws 11 and these trunnions include inwardly extending bearing portions 1 212 which fit within the recesses 1111, the inner ends of the bearing portions 12 being spaced from the inner ends of the recesses and from the outer ends of the metal support 7.

From the foregoing, it will be seen that the wooden core is formed of a plurality of wood sections, the grain of which extends laterally to substantially all points of the cylindrical surface of the core; that this laminated core is surrounded by an impactreceiving covering, and that the wooden core surrounds a rigid metal support which maintains the wooden sections 'in their proper relation.

In order to further reduce the impact noise, I may construct the core as shown in Figure 8 wherein adjacent wood sections 5-5 are separated by a cushioning or insulating strip 13 which may be of leather, cloth, or other suitable material.

It may be desirable to provide either of the cores thus described with inner and outer coverings of relatively soft and hard materials as indicated at 14 and 15 respectively' in Figure 10.

In some types of machines a platen which is much longer than is employed in the usual typewriting machine, is necessary, and in order to construct such an over size platen in accordance with my invention, I have constructed a core as disclosed in Figure 13. In this figure, I have shown a plurality of longitudinally arranged series of wood sections 5 wherein the sections are arranged end to end. The sections of one of the series are disposed intermediate the sections of adjacent series and the meetin ends of the sections are disposed in over apping relation and all of the sections are rigidly secured together. have mortise and tenon-like equipments at their meeting ends whereby they may be secured together in interlocking relations In forming a core as thus described, I pref- The sections thus formed erably first assemble a plurality of core units 16, 17 and 18. The inner ends of the cores 16 and 18 and both ends of the core 17 have their sections 5 alternately projecting so that when the units are assembled as shown in Figure 13 the meeting ends of the units will be disposed in interlocking relation.

I claim:

1. In a typewriter platen, a cylindrical core formedof wood the grain of which extends substantially radially to all points of the cylindrical surface of the core.

2. In a typewriter platen, a laminated core formed of a plurality of longitudinally extending wood sections the grain of which extends substantially radially to all points of the cylindrical surface of the core.

3. In a typewriter platen, a laminated core formed of a plurality of longitudinally extending wood sections thegrain of which extends substantially radially to all points of the cylindrical surface of the core, the sections respectively having outwardly diverging side faces, the sections being disposed side by side and rigidly secured together.

4. In a typewriter rplaten, a cylindrical core formed of wood the grain of which extends substantially radially to all points of the cylindrical surface of the core, and an impact-receiving covering surrounding the core and arranged in tight contact therewith.

5. In a typewriter platen, a laminated core formed of a plurality of longitudinally core formed of a plurality of longitudinally extending wood sections the grain of which extends substantially radially to all points 6. In a typewriter. platen, a laminated of the cylindrical surface of the core, the

sections respectively having outwardly diverging side faces, the sections being disposed side by side and rigidly secured together, and an impact-receiving covering surrounding the core and arranged in tight contact. therewith.

7. In a typewriter platen. a cylindrical core formed of wood the grain of which extends substantially radially to all points of the cylindrical surface of the core, and a metal support disposed axially within the core and extending substantially throughout the length thereof.

8. In a typewriter platen, a cylindrical core formed of wood the rain of which extends substantially .radialI to all points of the cylindrical surface 0 the core, and a metal supporting tube disposed axially within the core and extending substantially throughout the length thereof.

9. In a typewriter platen, a cylindrical core formed of wood the grain of which extends substantially radially to all points of the cylindrical surface. of the core, a metal support disposed axially within the core and extendin substantially throughout the length thereo the ends of the core beyond the ends of the metal support being provided with axial recesses, and trunnions for the core respectively secured to the ends of the core and having bearing portions fitting within said recesses.

10. In a typewriter platen, a cylindrical core formed of wood the grain of which extends substantially radially to all points of the cylindrical surface of the core, a metal support disposed axially within the core and extending substantially throughout the length thereof and an impact-receiving covering surrounding the core and arranged in tight contact therewith.

11. In a typewriter platen, a laminated core formed of a plurality of longitudinally extending wood sections the grain of which extends substantially radiall to all points of the cylindrical surface 0 the core, and a plurality of cushioning strips respectively located between the adjacent sections, the

sections and the strips being rigidly secured together.

12. In a typewriter platen, a laminated core formed of a plurality of longitudinally extending wood sections the grain of which extends substantially radially to all points of the cylindrical surface of the core, the sections respectively having outwardly diverging side faces, the sections being disposed side by side, and a pluralit of cushioning strips respectivel locate between adjacent side faces of ad acent sections, the sections and the strips being rigidly secured together.

13. In a typewriter platen, a laminated core formed of a plurality of longitudinall diverging side faces,

extending wood sections the grain of whic extends substantially radially to all points of the cylindrical surface of the core, a plu-' rality of cushioning strips respectively located between the adjacent sections, the sections and the strips being rigidly secured together, and an impact-receivingcovering surrounding the core and arranged in tight contact therewith.

14. In a typewriter platen, a laminated core formed of a plurality of longitudinally extending wood sections the grain of which extends substantially radially to all points of the cylindrical surface of the core, the sections respectively having outwardly the sections being disposed side by side, a plurality of cushioning strips respectively located between adjacent side faces of adjacent sections, the sections,

and the strips being rigidly secured together,

and an impact-receiving covering surrounding the core and arranged in tight contact therewith.

15. In a typewriter platen, the combination with a cylindrical core formedof wood the grain of which extends substantially radially to all points of the cylindrical sur-, face of the core, and inner and outer coverings surrounding the core and formed of relatively soft and hard materials.

16. In a typewriter platen, the combina-' cent series, and all of the sections being rigidly secured together.

18. In a typewriter platen, a cylindrical core formed of a plurality of longitudinally arranged series of wood sections arranged end to end, the sections of one series being disposed intermediate the sections of adjacent series, all of the sections being rigidly secured together, and a metal support disposed axially within the core and extendin substantially throughout the length thereo 19. In a typewriter platen, a cylindrical core formed of a plurality of longitudinally arranged series of wood sections arranged end to end, the sections of one series being disposed intermediate the sections of adjacent series, all of the sections being rigidly secured together, a metal support disposed axially within the core and extending substantially throughout the length thereof, a an impact-receiving covering surrounding the core and arranged in tight contact therewith.

20. In a typewriter platen, a cylindrical core formed of a plurality oflongitudinally arranged series of wood sections arranged end to end, the sections of one series being disposed intermediate the sections of adjacent series, and all of the sections being.

points of the cylindrical surface of the core, and a metal support disposed axially within the core and extending substantially throughout the length thereof.

22. In a typewriter platen, a cylindrical core formed of a plurality of longitudinally arranged series of wood sections arranged end to end, the sections of one series being disposed intermediate the sections of adjacent series, all of the sections being rigidly secured together, the grain of the wood sections extending substantially radially toall points of the cylindrical surface of the core, a metal support disposed axially within the core and extending substantially throughout the length thereof, and an impact-receiving covering surrounding the core and arrange in tight contact therewith.

23. In a typewriter platen, a cylindrical core formed of a plurality of units arranged end to end said ends having mortise and tenon equipment whereby to secure them together in interlocking relation.

24. In a typewriter platen, a cylindrical core formed of a plurality of units arranged end to end said ends having mortise and tenon equipment whereby to secure them together in interlocking relation, each unit comprising a plurality of wood sections arranged side by side in a circular series.

25. In a typewriter platen, a cylindrical core formed of a plurality of units arranged end to endsaid ends having mortise and tenon equipment whereby to secure them together in interlocking relation, each unit comprising a plurality of wood sections arranged side by side in a circular series, the grain of said sections extending substantially radially to all points of the cylindrical surface of the core.

26. In a typewriter platen, a cylindrical core formed of a plurality of units arranged end to end said ends having mortise and tenon equipment whereby to secure them together'in interlocking relation, and a metal support disposed axially Within the core and extending substantially throughout the length thereof.

In testimony whereof, I have hereunto subscribed my name.

GILBERT M. SCHERER. 

